Boy do I love me some horror-scifi, and considering George R.R. Martin (Game of Thrones) has described the adaptation of his novella as a "haunted house set in space," it seems fairly clear that that's what we're going to get.
From the description by Netflix:
"Based on George R. R. Martin's novella and set in the future on the eve of Earth's destruction, a crew of explorers journey on the most advanced ship in the galaxy, The Nightflyer, to intercept an alien spacecraft. One that might just hold the key to their survival."
Interestingly enough, Nightflyers was not originally a Netflix original. The art and the name seemed familiar, and after some searching it looks like Syfy had originally developed the show. It's a tiny bit worrisome considering Netflix's habit of buying up IP's which were originally doomed to fail (The Cloverfield Paradox and Mute to name a few) in an effort to maintain their subscriber base, but I'll stay optimistic for now.
More interesting is the vast difference in plot description between Netflix and Syfy, the latter's is as follows:
"Nightflyers follows eight maverick scientists and a powerful telepath who embark on an expedition to the edge of our solar system aboard The Nightflyer—a ship with a small tightknit crew and a reclusive captain—in the hope of making contact with alien life. But when terrifying and violent events begin to take place they start to question each other—and surviving the journey proves harder than anyone thought."
Time will tell.